Commit a70410db authored Sep 01, 2015 by Riley Andrews Committed by Omprakash Dhyade Mar 25, 2016

android: binder: Use wake up hint for synchronous transactions.



Use wake_up_interruptible_sync() to hint to the scheduler binder
transactions are synchronous wakeups. Disable premption while waking
to avoid ping-ponging on the binder lock.

Change-Id: Ic406a232d0873662f80148e37acefe5243d912a0
Signed-off-by: Todd Kjos <tkjos@google.com>
Git-commit: 443c026e90820170aa3db2c21d2933ae5922f900
Git-repo: https://android.googlesource.com/kernel/msm


Signed-off-by: Omprakash Dhyade <odhyade@codeaurora.org>

parent 7abcab5e

drivers/staging/android/binder.c

+10 −2

Original line number	Diff line number	Diff line
		@@ -1701,8 +1701,16 @@ static void binder_transaction(struct binder_proc *proc,
		list_add_tail(&t->work.entry, target_list);
		tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
		list_add_tail(&tcomplete->entry, &thread->todo);
		if (target_wait)
		if (target_wait) {
		if (reply \|\| !(t->flags & TF_ONE_WAY)) {
		preempt_disable();
		wake_up_interruptible_sync(target_wait);
		sched_preempt_enable_no_resched();
		}
		else {
		wake_up_interruptible(target_wait);
		}
		}
		return;

		err_get_unused_fd_failed: